Sustainable development using geosynthetics: European perspectives

June 1st, 2011

By Russell Jones and Neil Dixon This paper was originally presented at GRI-24, March 16, 2011, in Dallas, Texas, USA. It has been edited for Geosynthetics magazine style and format. The articles in this series encompass all types of geosynthetics and their applications viewed from the context of sustainability. Traditional solutions are compared with geosynthetic […]

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‘Old-timer’ recalls the history of geomembrane interface strength tests (Part 3)

June 1st, 2011

By Allan J. Breitenbach, P.E. Editor’s note: Part 1 of Allan Breitenbach’s treatise recalling geomembrane testing in days of yore appeared in the February/March issue of Geosynthetics and continued with Part 2 in the April/May issue. This concluding section continues with descriptions of factors that influence liner interface test strengths. -rb- Cohesion vs. no cohesion […]

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GRI-24 Conference: ‘Optimizing Sustainability Using Geosynthetics’

June 1st, 2011

By Bob and George Koerner This, our 24th annual conference, was a great success, according to the 160 persons in attendance on March 16, 2011, in Dallas, Texas. Inasmuch as it was the last day of the Geo-Frontiers Conference, the topic kept interest high thanks to the 20 authors making presentations of their respective papers. […]

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Geogrid focus group works towards specification

June 1st, 2011

GMA’s Geogrid Focus Group met March 15, 2011, during Geo-Frontiers in Dallas. The group is developing a table of values for biaxial geogrids for use in subgrade stabilization applications. The reason for this effort is to provide specifiers of state, county/municipal and commercial projects with information that will allow them to more easily specify geogrids […]

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Grid zone backfill

June 1st, 2011

From the GMA Techline RE: Backfill I know you indicated sand was the ideal grid zone backfill. I suppose crushed limestone has a high installation damage reduction factor due to its angular nature. But what about a rounded river gravel? We’re running out of ash as we near completion of an MSE wall, and a […]

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Puncture resistance

June 1st, 2011

From the GMA Techline RE: Puncture resistance We are proposing four consecutive layers of 16oz./yd2 geotextile overlying the geomembrane in the leachate pipe V-notch collection trench. Would you equate the puncture resistance of the four geotextile layers to one 64oz./yd2 geotextile? What are your thoughts? Thank you again! (Pamela | Florida) Reply: Yes, I would […]

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HDPE & LLDPE rates

June 1st, 2011

From the GMA Techline RE: HDPE & LLDPE rates I have always been under the impression that in using field tensiometers on jobsites that the rates for HDPE and LLDPE are different —HDPE at 2in./min. and LLDPE at 20in./min. However, I don’t have any documentation to back this up. Can you provide me with any […]

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Liner system

June 1st, 2011

GMA techline answers from Bob Koerner RE: Liner system I’m working on a project that will have a liner system as follows (from top to bottom): 12in. min.—chipped tires 3ft min.—recompacted mancos shale (max hydraulic conductivity 1x10-7cm/sec) Prepared subgrade Are there any internal friction angle results for either the tires or the shale? (No site […]

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GT weight

June 1st, 2011

From the GMA Techline RE: GT weight Is there any rule governing the geotextiles determined by weight and specification set? Or can I confirm that the properties specified in the rules are only mechanical and hydraulic properties without regard to weight? (José | Mexico) Reply: You ask a very perceptive question and you have essentially […]

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GT ageing

June 1st, 2011

From the GMA Techline RE: GT ageing I’ve been trying to track down the best references for ageing and degradation of geotextiles and found reference to ongoing research in this area. I’ve located the Valcros Dam references. Are there others that you could recommend? Also, do you know if there has been, or is currently, […]

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